Worms might not be the best pets, but they are great for your garden; they turn the soil and fertilize it with their own body processes. Worms are attracted to coffee grounds, so adding it to your garden beds will attract more of these helpful creatures.

The abrasive texture of coffee grounds will help strip oils and buildup from your hair. Pile them on in the shower or, for a much less messy strategy, just add some grounds to your shampoo or conditioner. (Best for brunettes as coffee can also darken hair.)